A monochromatic source of light is placed at a large distance $d$ from a metal surface. Photoelectrons are ejected at rate $n$ , the kinetic energy being $E$ . If the source is brought nearer to distance $d / 2$ , the rate and kinetic energy per photoelectron become nearly :

2n and 2E

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4n and 4E

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4n and E

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n and 4E

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Solution

The correct option is C 4n and E
The rate is inversely proportional to square of the distance: $n \propto \frac{1}{r^{2}}$

So the new rate will be $4 n$

Kinetic energy is not related to the distance, hence it will remain same $E$ .

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A monochromatic source of light is placed at a large distance d from a metal surface. Photoelectrons are ejected at rate n, the kinetic energy being E. If the source is brought nearer to distance d/2, the rate and kinetic energy per photoelectron become nearly :

The correct option is C 4n and EThe rate is inversely proportional to square of the distance: n∝1r2So the new rate will be 4nKinetic energy is not related to the distance, hence it will remain same E.

A monochromatic source of light is placed at a large distance $d$ from a metal surface. Photoelectrons are ejected at rate $n$ , the kinetic energy being $E$ . If the source is brought nearer to distance $d / 2$ , the rate and kinetic energy per photoelectron become nearly :

The correct option is C 4n and E
The rate is inversely proportional to square of the distance: $n \propto \frac{1}{r^{2}}$

So the new rate will be $4 n$

Kinetic energy is not related to the distance, hence it will remain same $E$ .